Someday, historians will look back on this heated exchange as the Lexington and Concord of the 2016 presidential race. Yesterday at a forum in Colorado, Chris Christie called Rand Paul and his fellow libertarians “dangerous” for criticizing the Obama administration’s domestic surveillance programs. Rand, flashing his trademark aqua buddha mischievousness, responded by pulling the trump card on Christie. “In the words of the governor’s favorite lyricist, ‘You know that flag flying over the courthouse, Means certain things are set in stone. Who we are, what we’ll do and what we won’t,” one of his senior advisers said.